socket c语言，基于socket的C语言编程,C语言实现的Socket编程

接收端程序：

#include

socket c语言？#include

#include

#include

python socket客户端、#include

#include

#include

c++socket？#define myport 319

char buf[200];

int main(int argc , char *argv[])

{

int sockfd,new_sockfd;

struct sockaddr_in sin_addr,pin_addr;

int len, pin_addr_size,i;

if ((sockfd = socket(AF_INET, SOCK_STREAM,0)) <0)

{

printf("can’t create socket\n");

exit(1);

}

memset( &sin_addr, 0, sizeof(sin_addr));

sin_addr.sin_family = AF_INET;

sin_addr.sin_addr.s_addr = htonl(INADDR_ANY);

sin_addr.sin_port = htons(myport);

if (bind(sockfd, (struct sockaddr *)&sin_addr, sizeof(sin_addr))<0)

{

printf("can’t bind socket\n");

exit(1);

}

if (listen(sockfd, 5) < 0 )

{

printf("listen error\n");

exit(1);

}

while (1)

{

if ((new_sockfd = accept (sockfd, (struct sockaddr *)&pin_addr,&pin_addr_size)) < 0)

{

printf("accept eroor\n");

exit(1);

}

if(recv(new_sockfd, buf, 200, 0) == -1)

{

printf("can’t receive packet\n");

exit(1);

}

printf("received from client:%s\n", buf);

close(new_sockfd);

}

return 0;

}

发送端程序：

#include

#include

#include

#include

#include

#include

#include

#define myport 319

char buf[200]="Hello World!";

int main(int argc , char *argv[])

{

int sockfd,new_sockfd;

struct sockaddr_in sin_addr,pin_addr;

int len, pin_addr_size,i;

if ((sockfd = socket(AF_INET, SOCK_STREAM,0)) <0)

{

printf("can’t create socket\n");

exit(1);

}

memset( &sin_addr, 0, sizeof(sin_addr));

sin_addr.sin_family = AF_INET;

sin_addr.sin_addr.s_addr = htonl(INADDR_ANY);

sin_addr.sin_port = htons(myport);

if((new_sockfd=connect(sockfd,(struct sockaddr *)&sin_addr, sizeof(sin_addr)))!=0)

{

printf("connect error!\n");

exit(1);

}

while(1)

{

if(send(sockfd, buf, strlen(buf), 0)<=0)

{

printf("发送失败！\n");

exit(1);

}

}

close(new_sockfd);

}

此时“Hello World”只能发送一次到接收端，然后发送端终止。

如果想让服务端一直接收“Hello World”，需要把accept放在While循环外面，close放在While循环外面。此时会刷屏。

但是这样仍然有问题，此时接收端只能接收第一个建立TCP连接的发送端，即成为了点对点程序。如果想要和接收端建立多个TCP连接，就出现了问题。

所以最好的方法是在接收端建立多线程：

接收端：

#include

#include

#include

#include

#include

#include

#include

#include

#define myport 6666

void *thread_function(void *arg)

{

char buf[200];

int new_sockfd = (int)arg;

while(1)

{

bzero(buf,200);

if(recv(new_sockfd, buf, 200, 0) == -1)

{

printf("can’t receive packet\n");

break;//以前是Exit

}

printf("received from client:%s\n", buf);

}

close(new_sockfd);

}

int main(int argc , char *argv[])

{

int sockfd;

struct sockaddr_in sin_addr;

if ((sockfd = socket(AF_INET, SOCK_STREAM,0)) <0)

{

printf("can’t create socket\n");

exit(1);

}

memset( &sin_addr, 0, sizeof(sin_addr));

sin_addr.sin_family = AF_INET;

sin_addr.sin_addr.s_addr = htonl(INADDR_ANY);

sin_addr.sin_port = htons(myport);

if (bind(sockfd, (struct sockaddr *)&sin_addr, sizeof(sin_addr))<0)

{

printf("can’t bind socket\n");

exit(1);

}

if (listen(sockfd, 5) < 0 )

{

printf("listen error\n");

exit(1);

}

while(1)

{

struct sockaddr_in pin_addr;

int pin_addr_size;

int new_sockfd;

if ((new_sockfd = accept (sockfd, (struct sockaddr *)&pin_addr,&pin_addr_size)) < 0)

{

printf("accept eroor\n");

exit(1);

}

pthread_t a_thread;//开辟线程

pthread_create(&a_thread,NULL,thread_function,(void *)new_sockfd);//创建进程

}

return 0;

}

发送端：

#include

#include

#include

#include

#include

#include

#include

#define myport 6666

char buf[200];

int main(int argc , char *argv[])

{

int sockfd,new_sockfd;

struct sockaddr_in sin_addr,pin_addr;

int len, pin_addr_size,i;

if ((sockfd = socket(AF_INET, SOCK_STREAM,0)) <0)

{

printf("can’t create socket\n");

exit(1);

}

memset( &sin_addr, 0, sizeof(sin_addr));

sin_addr.sin_family = AF_INET;

sin_addr.sin_addr.s_addr = htonl(INADDR_ANY);

sin_addr.sin_port = htons(myport);

if((new_sockfd=connect(sockfd,(struct sockaddr *)&sin_addr, sizeof(sin_addr)))!=0)

{

printf("connect error!\n");

exit(1);

}

while(1)

{

scanf("%s",buf);

if(send(sockfd, buf, strlen(buf), 0)<=0)

{

printf("发送失败！\n");

exit(1);

}

bzero(buf,200);

}

close(new_sockfd);

}